JPH10234881A - Fire extinguishing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent rust from generating on the piping of a fire extinguishing equipment by covering the meniscus part of a remaining fire extinguishing liquid part in the piping of the fire extinguishing equipment, with an inert gas. SOLUTION: For example, on a secondary side piping 2 of a warning valve 1 of a preparatory operation type sprinkler fire extinguishing equipment, an innert gas such as nitrogen gas is enclosed. That is, after a water draining by a N2 gas pressure after a water discharging test, water W for fire extinction remains in a remaining fire extinguishing liquid part of an erecting lower piping 6 of the secondary side piping 2, and the water cannot be totally drained. For this reason, a nitrogen gas N2 G is filled in the secondary side piping 2 by driving an N2 gas generating device 10, and the inside of the pipe 2 is kept at a specified gas pressure, e.g. 1kg/cm<2> . This nitrogen gas N2 G covers the meniscus part of the remaining fire extinguishing liquid part of the erecting lower piping 6, and rust is prevented from generating on the meniscus part. By performing the same processing after a water circulation at the time of fire, rust is prevented from generating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pre-actuated sprinkler fire extinguishing system, a dry sprinkler extinguishing system, or
Fire extinguishing equipment piping (fittings, strainers,
The present invention relates to a fire extinguishing system in which air and a fire extinguishing liquid (water, an aqueous solution of foam, fire-extinguishing solution, etc.) are enclosed in a room together with a valve.

[0002]

2. Description of the Related Art For example, in a pre-actuated sprinkler fire extinguishing equipment, a water discharge test of the equipment must be performed immediately after the equipment is constructed. This water discharge test is performed in the following procedure. First, the equipment is placed in the alert state, and the alarm valve is opened by opening the manual start valve arranged in parallel with the electric valve that is opened by the operation of the fire detector. Then, the fire extinguishing water is sent to the secondary pipe of the alarm valve, and the operation of the alarm valve, that is, the presence or absence of the water discharge alarm can be checked. At this time, the fire-extinguishing water also enters the downpipe connecting the closed sprinkler and the secondary pipe. The terminal test valve is opened as it is, and dummy discharge for one head is performed, and it is checked whether a pressure equal to or more than a predetermined pressure is applied to the terminal test valve at the farthest point.

[0003] After the water discharge test, the alarm valve is closed by closing the manual start valve. At the same time, for example, 1
Most of the water for fire extinguishing in the secondary pipe is discharged from the terminal test valve by the air compressor set to Kg / cm ² . When it is finished, close the terminal test valve, open the drain valve around the alarm valve, and drain the fire extinguishing water in the secondary vertical pipe just after the alarm valve.

[0004]

However, fire extinguishing water remains in the falling pipe and cannot be drained, resulting in residual water. This residual water, in combination with the oxygen of the compressed air from the air compressor, causes rust on the meniscus of the residual water in the falling pipe. Therefore, when the fire extinguishing water is discharged, the rust may be peeled off to cause clogging of the water discharge port of the sprinkler head, or a hole may be formed in the fire extinguisher piping when corrosion progresses. Further, the compressed air within the secondary side piping to exit the threaded connection of the pipe, a predetermined pressure, for example, becomes below 0.7 Kg / cm ^2, moving the tossed compressor in operation of pressure switch for monitoring the pressure drop alarm , Is always maintained at a constant pressure. If early, every 2-3 hours,
Normally, the pressure is increased by an air compressor about once a day. At this pressure increase, fresh air, that is, oxygen is always injected, so that the corrosion does not stop.

In view of the above circumstances, an object of the present invention is to prevent fire extinguishing equipment piping from rusting.

[0006]

According to the present invention, there is provided a fire extinguishing system in which a residual fire extinguishing liquid portion is generated in a fire extinguishing system pipe; wherein the meniscus portion of the residual fire extinguishing liquid portion is covered with an inert gas. ,.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A meniscus part of a residual fire extinguishing liquid generated in a fire extinguishing equipment pipe is covered with an inert gas. In this piping, air and fire-extinguishing liquid (water, foam fire-extinguishing agent aqueous solution, strengthening liquid, etc.) are enclosed together as in pre-operation type sprinkler fire extinguishing equipment, dry sprinkler extinguishing equipment, dry foam extinguishing equipment It is such a fire extinguisher piping.

[0008] The residual fire extinguishing liquid portion is generated in, for example, a take-off pipe portion connecting the secondary side pipe and the closed type sprinkler head, a bent portion of a horizontal pipe, and an intersection of an L-shaped pipe. .

As the inert gas, for example, nitrogen gas, argon, neon, helium and the like are used. When covering the meniscus part of the residual fire extinguishing liquid part with nitrogen gas, for example,
The nitrogen gas generator is connected to the secondary pipe to supply the nitrogen gas, and the nitrogen gas is sealed in the falling pipe. An appropriate method is adopted as necessary. For example, after evacuating the inside of the secondary pipe, nitrogen gas may be supplied from the sub tank into the secondary pipe, and then nitrogen gas may be supplied from the nitrogen gas generator.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. An inert gas, for example, nitrogen gas N ₂ G is provided in the secondary pipe 2 of the alarm valve 1 of the pre-actuated sprinkler fire extinguishing equipment.
Is enclosed. The pipe 2 is provided with a closed sprinkler head SP and a terminal test valve 4.

The closed type sprinkler head SP is connected to the secondary side pipe 2 through a down pipe 6. This secondary pipe 2 is connected to an N ₂ gas generator 10 via a regulator 8.

As the N ₂ gas generator 10, for example, an adsorbent which is a kind of activated carbon is used, and oxygen molecules are forced into holes on the surface of the adsorbent by utilizing the difference in diameter between nitrogen molecules and oxygen molecules. A method of extracting nitrogen molecules is used. The regulator 8 sets the pressure in the secondary pipe 2 to a predetermined pressure. For example, a gas pressure of 4 kg / cm ² is set to 1 kg / c.
lowered to m ^2. The speed controller 12 limits the amount of gas supplied to the secondary pipe 2 to a predetermined amount.

In FIG. 1, 11 is an air filter, 13
Is a check valve, 14 is a pressure switch for monitoring pressure drop alarm,
15 is a drain valve, 16 is a pressure switch for water discharge warning, 18
Is a piston chamber, 19 is an orifice, 20 is a check valve, 21
Denotes a control valve, 22 denotes a solenoid valve, 23 denotes a pre-action control panel, 24 denotes a fire receiver, 25 denotes a fire detector, and 26 denotes a manually activated valve.

Next, the operation of this embodiment will be described for each case. During monitoring: At all times, the facility monitoring pressure is applied to the primary pipe 2A and the piston chamber 18 of the alarm valve 1, and the monitored compressed gas pressure is applied to its secondary side. The solenoid valve 22 is normally closed, the pressure in the piston chamber 18 is maintained, and the alarm valve 1 is closed.

At the time of the test: To perform the water discharge test, the manual start valve 26 is opened and the alarm valve 1 is opened. Then, the alarm valve 1
Since the fire extinguishing water is sent to the secondary pipe 2 and the pressure switch 16 is operated, the operation of the alarm valve 1 can be confirmed, that is, the presence or absence of the water discharge alarm can be confirmed. At this time, the fire-extinguishing water also enters the falling pipe 6 that connects the closed-type sprinkler head SP and the secondary pipe 2.

[0016] The terminal test valve 4 is opened as it is, and dummy water is discharged for one closed sprinkler head SP, and it is checked whether or not a pressure equal to or higher than a predetermined pressure is applied to the terminal test valve 4 at the farthest point.

After the water discharge test, the alarm valve is closed by closing the manual start valve 26. After the test valve 4 is drained by N2 gas pressure, the test valve 4 is closed and the drain around the alarm valve 1 is drained. The valve 15 is opened, and the fire extinguishing water in the secondary vertical pipe immediately after the alarm valve 1 is discharged.

At this time, since the fire extinguishing water W in the secondary pipe 2 remains in the residual fire extinguishing liquid part 30, it cannot be completely discharged. This residual fire-extinguishing liquid part 30 is, for example, the deflection of the falling pipe 6 shown in FIGS. Part 2Z, intersection 2 of L-shaped pipe 2L shown in FIG.
X, etc. The horizontal pipe portion 2f of the L-shaped pipe 2L is inclined with respect to the horizontal line F.

The N ₂ gas generator 10 is driven to fill the secondary pipe 2 with nitrogen gas N ₂ G, and the inside of the pipe ² is maintained at a predetermined gas pressure, for example, 1 kg / cm ² .

At this time, since the nitrogen gas N ₂ G covers the meniscus portion M of the residual fire extinguishing liquid portion 30, the meniscus portion M
No rust occurs in

At the time of fire: When water is passed through the secondary pipe 2 at the time of fire, a residual fire extinguishing liquid part is generated as in the test, but the meniscus part of the residual fire extinguishing liquid part is covered with nitrogen gas as in the test. The generation of rust can be prevented.

The operation of the fire extinguishing system in the event of a fire will be briefly described. When a fire occurs, first the fire detector is activated,
The electric valve 22 is opened through the operation of the fire receiver 24 and the preaction control panel 23 according to the signal. When the electric valve 22 is opened, the pressurized water in the piston chamber 18 is discharged. At this time, a small amount of the primary pressure is supplied via the orifice 19, but since the amount of drainage from the motor-operated valve 22 is large, the pressure in the piston chamber 18 decreases and the alarm valve 1 is opened.

When the alarm valve 1 is opened, the pressurized water flows into the secondary side, and at the same time, flows from the valve seat to the pressure switch 16 to issue a water discharge alarm. Further, when the fire progresses, the heat causes the closed sprinkler head SP to open, discharge the nitrogen gas N ₂ G, and then start water discharge.

When the pressure in the pipe drops due to the flow and discharge of the fire-fighting water in the pipe, a pressure switch provided in a pressure air tank (not shown) is operated, and a pump start signal is sent to a pump control panel. The pump is operated and the water is extinguished.

A second embodiment of the present invention will be described with reference to FIG. The difference between this embodiment and the first embodiment is that, when nitrogen gas is supplied to the secondary pipe 2, a sub-tank 40 filled with nitrogen gas is used in addition to the N ₂ gas generator 10. This sub-tank 40 is connected to the N ₂ gas generator 10 via a regulator 41.

In this embodiment, first, the sub tank 4
The nitrogen gas in the chamber 0 is supplied to the secondary pipe 2, and then the nitrogen gas is supplied from the N ₂ gas generator 10. Since the N ₂ gas generator 10 cannot rapidly generate a large amount of nitrogen gas, the use of the sub-tank 40 for the first time allows the secondary pipe 2 to be filled with nitrogen gas in a short time.
Also, unlike the sub-tank 40, the N ₂ gas generator 10 can continuously generate nitrogen gas for a long time, so that it can be replenished any time when the gas pressure in the secondary pipe decreases.

A third embodiment of the present invention will be described. The difference between this embodiment and the first and second embodiments is that
When nitrogen gas is sealed in the inside, first, vacuum is evacuated to remove air in the piping, and then nitrogen gas is supplied. Note that, as the inert gas, argon, neon, helium, or the like is used in addition to the nitrogen gas.

[0028]

As described above, according to the present invention, since the meniscus portion of the residual fire extinguishing liquid is covered with the inert gas, rust can be prevented from being generated. Therefore, as compared with the conventional example, the service life of the fire extinguishing equipment piping is extended, and maintenance is facilitated.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the falling pipe of FIG.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is an enlarged sectional view of the horizontal pipe of FIG. 1;

FIG. 5 is an enlarged cross-sectional view taken along line VV of FIG. 4;

FIG. 6 is an enlarged sectional view of the L-shaped pipe of FIG. 1;

FIG. 7 is a diagram showing a second embodiment of the present invention.

[Description of Signs] 1 Alarm valve 2 Secondary pipe 6 Standing pipe 10 N2 gas generator 30 Residual fire extinguishing liquid part M Meniscus part SP Closed sprinkler head

Claims (4)

[Claims] 1. A fire extinguisher in which a residual fire extinguishing liquid part is generated in a fire extinguishing equipment pipe; wherein a meniscus part of the residual fire extinguishing liquid part is covered with an inert gas. 2. A fire-extinguishing fire extinguishing system pipe in which a closed-type sprinkler head is disposed via a down pipe on a secondary pipe of an alarm valve. Fire extinguishing equipment. 3. The fire extinguishing system according to claim 1, wherein the inert gas is nitrogen gas, and the nitrogen gas is supplied to a residual fire extinguishing liquid by a nitrogen gas generator. 4. The fire extinguishing system according to claim 1, wherein the inert gas is nitrogen gas, and the nitrogen gas is supplied to the residual fire extinguishing liquid by a sub-tank and a nitrogen gas generator.